So I have a 2003 bayliner 185. I know not a wakeboard boat so dont trash me. I am going to put a stereo in it. Question--how do I support the radio once I do the GelCoat/Fiberglass cuts and push it through. Should I make a wood brace and glue it to the backside of the fiberglass? Also cutting a hole is scareing me a little. I hear a 5" hole saw should do the trick for the speakers. But how do I cut the rectangle for the head unit?